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Old 09-11-2018, 06:18 PM
Meee Meee is offline
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Default Tach issue

Hi everyone, I have a mid 60's Thiokol 1404 V4 and put all new digital gauges in a new dash panel but I can't seem to get the tachometer to display properly. It has a switch on the back to select 4/6/8 cylinders. I do have it set to 4 but it doesn't read properly in any position. Anybody have a suggestion? Thanks.

Last edited by Meee; 09-11-2018 at 06:25 PM. Reason: Spelling
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Old 09-11-2018, 06:58 PM
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Default Re: Tach issue

Where are you connecting the wires? The tach sense should be connected to the same wire on the coil that goes to the points.
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Old 09-11-2018, 08:16 PM
topwelder44 topwelder44 is offline
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Default Re: Tach issue

some after market tach if its not set on 8 cyl. there is a wire that has to b cut----they sometimes have a small loop sticking out the back of the tach
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Old 09-11-2018, 09:13 PM
Meee Meee is offline
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Default Re: Tach issue

Oh yes, I think that is my problem and I forget to mention that I also added electronic ignition. No points. I'm hooked to the negative wire going to the coil as instructed by the tachometer instructions. This tachometer has a switch no wire loop to cut.
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Old 09-12-2018, 10:53 AM
topwelder44 topwelder44 is offline
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Default Re: Tach issue

the tach should be hooked to the wire going to the dist.---NOT the power wire----and the coil has no polarity btw-----try putting the points back in----(and leaving them in----lol)----I ve had no luck with aftermarket kits----I would look into a crank trigger set up before a dist. update kit---many moons ago I would go to the junk yard and get a electronic dist. if I was working on a ford or dodge and use a chevy brain box out of a gm hei dist and wire it in line getting rid of the ford and dodge wiring mess----works great and a gm brain will adjust to a 4-6 or 8 cyl. on its own----my sv200 was bought cheap because of the aftermarket junk dist. kit that supported the halls system----pushed it on the trailer----got it home dug through the cab and floor putting the points back in and drive it off the trailer 3 years ago and still using the same points I found on the floor to this day
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Old 09-12-2018, 12:35 PM
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Default Re: Tach issue

If it is erratic reading, it needs a diode in line with the sense line.


(from the vdo troubleshooting guide) (I had to do this to my ST)
To Reduce or Eliminate Erratic Operation in Tachometers
1. Purchase diode #1N4005 from your local electronics store.
2. Cut both ends of the diode so each is approx. 3/ 4" long.
3. Crimp a 1/ 4" female spade connector on the end of the diode with the
silver band.
4. Crimp a butt-splice connector on the other end of the diode.
5. Crimp the opposite end of the b utt-splice connector to the wire connected
to ignition signal source.
6. Connect 1/ 4" female spade connector used in step # 3 above to terminal
# 4 on the back of the tachometer.
7. Connect a ground (-) wire to terminal # 3.
8. Connect a switched 12-volt power wire to terminal # 2.
9. Set switches for the appropriate number of cylinders


hope this helps.
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Old 09-12-2018, 12:45 PM
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Default Re: Tach issue

BTW, almost any standard diode will work, min 20 volt voltage.
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Old 09-26-2018, 09:47 AM
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Default Re: Tach issue

Hey guys , I too have installed electronic ignition and a new SW rpm gauge , My gauge is not reading wrong but is acting sluggish slow to respond . I ordered the diode`s IN4005 from amazon and installed one silver band facing the gauge and it didnt get any better . I can live with it but it would be nice to have the gauge responding faster . any ideas ?
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Old 09-26-2018, 10:33 AM
topwelder44 topwelder44 is offline
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Default Re: Tach issue

buy a new tach.----they have them that wrap around the coil wire and pick up the signal that way----I use them on are race car and my airplanes
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